Crankpin grinder



March 10, E s HANSON JR CRANK PIN GRINDER Filed June 9, 1941 2Sheets-Sheet l INVENTOR.

BY M,

March 10, s HANSON JR CRANK PIN GRINDER Filed June 9, 1941 2Sheets-Sheet 2 IN V EN TOR.

Patented Mar. 10, 1942 Claims.

This invention aims to provide a novel structure for grinding the pin ofthe crank shaft of an engine, preferably an internal combustion engine,the construction being such that much of the engine structure will comeinto play during the grinding operation, it being necessary to supply nomore than a simple mechanism, supplemental to the engine parts, to bringabout a grinding operation.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the presentinvention appertains.

With the above and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings:

Fig. 1 shows in transverse section, a device embodying the invention,most parts being in elevation;

Fig. 2 is an elevation wherein the parts are viewed at right angles tothe showing of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is an elevation showing one of the nuts, parts being sectionedaway;

Fig. 5 is a sectional view showing the device in use on an internalcombustion engine of the yp Fig. 6 is a top plan of the structuredelineated in Fig. 5.

The numeral l marks a crank pin, preferably forming part of an internalcombustion engine. The crank shaft disks are shown at 2. The numeral 3marks a fixed bearing on a pitman 4, the bearing cooperating with thecrank pin I. The pitman 4 is pivoted, as indicated at 5a in Fig. 5, toan engine piston 6a, mounted to reciprocate in an engine cylinder la.

Bolts 8 and their nuts 9 are used to hold assembled with the fixedbearing 3 and with the crank pin I, a removable bearing (not shown),complemental to the bearing 3 and cooperating with that bearing toreceive the crank pin I,

when the engine is in working condition. Whenthe grinding operation isto take place, the aforesaid complemental bearing (not shown) isremoved, and its place is taken by spacers ill on the bolts 8. Springplates H are placed on the bolts 8 and are held in abutment with thespacers IE1 by one of the nuts 9, and a specially constructed nut [2.The spring plates H hold the crank pin I seated in the bearing 3.

The nut l2 has a spindle It, provided with a transverse shoulder ii ofany desired construction. A nut I6 is threaded on the lower part of thespindle I l and is held against rotation, backwardly, by a lock washerii.

The machine includes a frame, denoted as a whole by the numeral I8, theframe including a tubular bearing [9, disposed parallel to the spindlehi, the bearing having transverse, outstanding arms 20 and 2|, mountedto swing on the spindle, the arm 2| abutting against the lock washer H,which is retained by the nut 16. A coiled spring 22 surrounds thespindle l4, and abuts at its upper end against the shoulder IS on thespindle, the spring abutting at its lower end against the arm 2|.

A grinding mechanism is provided, and includes a motor 23 secured to thelower end of the bearing member 19 of the frame i3. A shaft 24 ismounted to rotate in the bearing l9, and is connected to the shaft 25 ofthe motor 23 by a coupling 26. A grinding wheel 21 is secured to theupper end of the shaft 24 and engages the crank pin I.

When the parts are assembled as shown in Fig. 1, the frame I8 is swunglengthwise of the crank pin I, on the spindle l4 of the nut l2, themotor 23, the shaft 25, the coupling 26 and the shaft 24 impart rotationto the grinding wheel 21, and the irregularities on the crank pin I areground away when the crank pin is caused to move in an orbit. If thedevice is used on an automobile, the after end of the automobile may bejacked up, and the crank pin I be caused to move in an orbit by turningmanually, the rear wheels of the automobile.

The position of the grinding wheel 21, relatively to the crank pin I, isattained by manipulating the nut it. The function of the spring 22 is tohold the arm 2! of the frame l8 down on the washer I! when the grindingwheel 21 moves over a low place in the crank pin i.

In Figs. 5 and 6, parts hereinbefore described have been designated bynumerals already used,

with the suffix a. Figures 5 and 6 show that the device is useful inconnection with a motor of the V-type, as well as with a motor thecylinders of which are disposed vertically above the crank shaft.

Having thus described the invention, What is claimed is:

1. A crank pin grinder comprising an engine cylinder, a piston slidablymounted in the cylinder, a pitman pivoted to the piston and providedwith a fixed bearing shaped to receive a crank pin, a bolt carried bythe fixed bearing and forming part of means for assembling acomplemental, removable bearing assembled with the fixed bearing andwith a crank pin, a nut threaded on the bolt and having a spindle, aframe mounted on the spindle, and grinding mechanism carried by theframe and so located as to engage a crank pin mounted in the bearings.

2. A crank pin grinder constructed as set forth in claim 1, and whereinthe frame is mounted to swing on the spindle, to carry the grindingmechanism lengthwise of a crank pin mounted in the bearings.

3. A crank pin grinder constructed as set forth in claim 1, incombination with a spacer on the bolt, and a spring on the bolt, betweenthe spacer and the nut, the spring exerting pressure in the direction ofthe fixed bearing, on a crank pin mounted in the bearings.

4. A crank pin grinder constructed as set forth in claim 1, and whereinthe frame is mounted to swing on the spindle, lengthwise of a crank pinwhich is mounted as aforesaid, and to move for adjustment longitudinallyof the spindle, to bring the grinding mechanism into engagement with acrank pin which is so mounted, means under the control of an operatorand carried by the spindle and cooperating with the frame to advance thegrinding mechanism into engagement with a crank pin which is so mounted,and spring means engaged with the frame and with the spindle to hold theframe engaged with the means under the control of an operator.

.5. A device of the class described, constructed as set forth in claim1, and wherein the grinding mechanism comprises a shaft supported forrotation on the frame, a motor carried by the frame and engaged with oneend of the shaft, and a grinding wheel mounted on the opposite end ofthe shaft.

EDWARD S. HANSON, JR.

